In economics,the term marginal usually refers to:

A) a small change in an economic variable.
B) a low-quality product or resource.
C) an unimportant and irrelevant economic variable.
D) an all-or-nothing economic decision.
E) a footnote or minor point.

In economics, the term marginal refers to a small change in an economic variable, such as the cost or benefit of producing one more unit of a good. This concept is important in decision-making and understanding how individuals and firms make choices based on the marginal analysis of costs and benefits.